[krip-toh-kris-tl-in, -ahyn]
adjective Mineralogy.
having a microscopic crystalline structure.

1860–65; crypto- + crystalline Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cryptocrystalline (ˌkrɪptəʊˈkrɪstəlaɪn)
(of rocks) composed of crystals that can be distinguished individually only by the use of a polarizing microscope

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
cryptocrystalline   (krĭp'tō-krĭs'tə-lĭn, -līn')  Pronunciation Key 
Having a microscopic crystalline structure, as the mineral chalcedony does.
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